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That was done with the Orion Starshoot Pro..
The Histogram was exposed a bit over 1/2 way across the X axis.
There was a clean, white t-shirt pulled tightly over the dew sheild so that it was trim and flat across the objective, the objective was pointing away from the sun at a clear blue sky.. I did get an EL panel back in the day, however I got one of the small cuttable ones, and at the time I was using a 102mm refractor, which the small cuttable EL Sheet did not fully illuminate, so I sold the panel... I have a little over an hours data of Rho Ophiucuhi that I can't process untill I get some usable flats...
Is it at all possible that the material in the T-shirt is causing the problem? its a fine, microfibre like gym shirt, should I perhaps try something thicker like a cotton shirt?
Thanks for any further info..
Alex.
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